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1 Cambridge International Examinations Cambridge International Advanced Level MATHEMATICS 9709/72 Paper 7 MARK SCHEME Maximum Mark: 50 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the series for most Cambridge IGCSE, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components. IGCSE is a registered trademark. This document consists of 9 printed pages. UCLES 2017 [Turn over

2 Mark Scheme Notes Marks are of the following three types: M A B Method mark, awarded for a valid method applied to the problem. Method marks are not lost for numerical errors, algebraic slips or errors in units. However, it is not usually sufficient for a candidate just to indicate an intention of using some method or just to quote a formula; the formula or idea must be applied to the specific problem in hand, e.g. by substituting the relevant quantities into the formula. Correct application of a formula without the formula being quoted obviously earns the M mark and in some cases an M mark can be implied from a correct answer. Accuracy mark, awarded for a correct answer or intermediate step correctly obtained. Accuracy marks cannot be given unless the associated method mark is earned (or implied). Mark for a correct result or statement independent of method marks. When a part of a question has two or more method steps, the M marks are generally independent unless the scheme specifically says otherwise; and similarly when there are several B marks allocated. The notation DM or DB (or dep*) is used to indicate that a particular M or B mark is dependent on an earlier M or B (asterisked) mark in the scheme. When two or more steps are run together by the candidate, the earlier marks are implied and full credit is given. The symbol FT implies that the A or B mark indicated is allowed for work correctly following on from previously incorrect results. Otherwise, A or B marks are given for correct work only. A and B marks are not given for fortuitously correct answers or results obtained from incorrect working. Note: B2 or A2 means that the candidate can earn 2 or 0. B2/1/0 means that the candidate can earn anything from 0 to 2. The marks indicated in the scheme may not be subdivided. If there is genuine doubt whether a candidate has earned a mark, allow the candidate the benefit of the doubt. Unless otherwise indicated, marks once gained cannot subsequently be lost, e.g. wrong working following a correct form of answer is ignored. Wrong or missing units in an answer should not lead to the loss of a mark unless the scheme specifically indicates otherwise. For a numerical answer, allow the A or B mark if a value is obtained which is correct to 3 s.f., or which would be correct to 3 s.f. if rounded (1 d.p. in the case of an angle). As stated above, an A or B mark is not given if a correct numerical answer arises fortuitously from incorrect working. For Mechanics questions, allow A or B marks for correct answers which arise from taking g equal to 9.8 or 9.81 instead of 10. UCLES 2017 Page 2 of 9

3 The following abbreviations may be used in a mark scheme or used on the scripts: AEF/OE Any Equivalent Form (of answer is equally acceptable) / Or Equivalent AG CAO CWO ISW SOI SR Answer Given on the question paper (so extra checking is needed to ensure that the detailed working leading to the result is valid) Correct Answer Only (emphasising that no follow through from a previous error is allowed) Correct Working Only often written by a fortuitous answer Ignore Subsequent Working Seen or implied Special Ruling (detailing the mark to be given for a specific wrong solution, or a case where some standard marking practice is to be varied in the light of a particular circumstance) Penalties MR 1 A penalty of MR 1 is deducted from A or B marks when the data of a question or part question are genuinely misread and the object and difficulty of the question remain unaltered. In this case all A and B marks then become follow through marks. MR is not applied when the candidate misreads his own figures this is regarded as an error in accuracy. An MR 2 penalty may be applied in particular cases if agreed at the coordination meeting. PA 1 This is deducted from A or B marks in the case of premature approximation. The PA 1 penalty is usually discussed at the meeting. UCLES 2017 Page 3 of 9

4 ( ) 2000 (= ) M ± z " " M1 Allow any z-value z = 1.96 B to (3 sf) A1 As final answer. Must be an interval Allow to Total: 4 2(i) E(X) = B1 Var (X) = B1 Both to 3dp or better Total: 4 2(ii) E(X) Var(X) B1 Condone = 2(iii) ( ! 4! ) e M1 Any λ. Allow with one end error = 0.59(0) (3 sfs) A1 Allow Total: 2 UCLES 2017 Page 4 of 9

5 3(i) Est (µ) = 923/400 or or 2.31 (3 sf) B1 Est(σ 2 ) = "2.3075" OE M1 = or 2.61 (3 sf) A1 (Note: Biased Var= scores M0) Total: 3 3(ii) H 0 : Pop mean (or µ) = "2.31" or "2310" H 1 : Pop mean (or µ) > "2.31" or "2310" B1 FT ± 2.6 "2.310" = 1.27 M1 A1 Standardising using their values, Accept 1.28 Comp (OE) M1 Valid comparison z values or areas No evidence that incomes in the region greater A1 FT OE FT their z. No contradictions (No FT for 2 tail test max score B0 M1 A1 M1 for comp 1.96 A0) Note: Accept alternative CV method Total: 5 UCLES 2017 Page 5 of 9

6 4(i) C M1 No end errors = A1 As final answer Total: 2 4(ii) H 0 : Pop proportion=0.25 H 1 : Pop proportion<0.25 B1 Allow p or π, not "proportion" (Accept anywhere in the question) M1 Must be B(25,0,25) No end errors = A1 comp 0.01 M1 Valid comparison There is evidence that the claim is not justified A1 FT OE. No contradictions Total: 5 UCLES 2017 Page 6 of 9

7 5(i) h=0.25 h = 0.5 grad = 0.5 M1 P(X < 2) = 4 P(X < 1) M1 f(x) = 0.5x A1 P(X < 2) = 1 A1 a = 2 A1 0.5 a 0.5a = 1 M h / = 1 M1 h / = 1 a = 2 A1 grad = 0.5 P(X < 2) = 1 A1 f(x) = 0.5x A1 Total: 5 5(ii) m 0 0.5xdx = 0.5 M1 Attempt ( ) f x dx= 0.5 Ignore limits = 0.5 x = 2 4 m 0 A1FT Correct integration (ft f(x) ) & limits = 0.5 m = 2 or 1.41 (3 sf) A1 1 or by similarity m = 2 2 M2 = 2 A1 Total: 3 UCLES 2017 Page 7 of 9

8 2 6(i) e M1 Allow incorrect λ 2! = (3 sfs) A1 Total: 2 6(ii) N(60, 60) B1 seen or implied (= 0.710) M1 allow with wrong or missing cc 60 1 φ(" 0.710") = φ("0.710") M1 For area consistent with their working = (3 sf) A1 Total: 4 6(iii) λ = (= 186/35) (= 5.314) M1 2 3 ( ! ) e M1 Allow incorrect λ. Allow one end error. = (3 sfs) A1 Total: 3 UCLES 2017 Page 8 of 9

9 7(a) E(X 1 +X 2 ) = = 8.4 Var(X 1 +X 2 ) = 2 1.1² = 2.42 B1 Both. Seen or implied (or sd = 1.56) (= 1.029) M1 Standardising with their mean and var (no sd / var mix) φ("1.029") M1 For area consistent with their working = (3 sf) A1 Total: 4 7(b) E(X) = 20.5 B1 Var(X) = (= ) M1 correct expression oe 0 "20.5" (= 1.966) M1 correct standardisation using their E & V (no sd/var mix) "108.75" ignore any attempted cc φ(" 1.966") = 1 φ("1.966") (= ( )) M1 For area consistent with their working = or 2.46% (3 sf) A1 Accept Total: 5 UCLES 2017 Page 9 of 9

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